<template>
	<view>
    <my-search @click="searchbox"></my-search>
		<view class="scroll-view-container">
      
      <!-- 左侧滑动区域 -->
      <scroll-view class="left-scroll-box" scroll-y="true" :style="{height: wh + 'px'}">
        
       <block  v-for="(item,i) in catelist" :key="i" >
        <view :class="['left-scroll-view-item',i===active ? 'active':'']" @click="changeActive(i)">{{item.cat_name}}</view>
        </block>
       
      </scroll-view>
      <!-- 右侧滑动区域 -->
      <scroll-view scroll-y="true"  :style="{height: wh + 'px'}" :scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item2,i2) in catelevel2" :key="i2">
          <!-- 二级分类标题 -->
          <view class="cate-lv2-title">/{{item2.cat_name}}/</view>
          <!-- 当前二级分类下的三级分类列表 -->
          <view class="cate-lv3-list">
           <!-- 三级分类的item项 -->
            <view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotgoodlist(item3)">
              <!-- 三级分类图片 -->
              <image :src="item3.cat_icon" ></image>
              <!-- 三级分类的文本 -->
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view>
      
      </scroll-view>
    </view>
	</view>
</template>

<script>
     import badgeMix from '@/mixins/tabbar-badge.js'
	export default {
      mixins:[badgeMix],
		data() {
			return {
				// 可用高度
        wh:0,
        catelist:[],
        active:0,
        catelevel2:[],
        scrollTop:0
			};
		},
    onLoad() {
      const sysInfo =   uni.getSystemInfoSync()
      // console.log(sysInfo)
      this.wh = sysInfo.windowHeight -50
      this.getcatelist()
    },
    methods:{
    async  getcatelist(){
      const  {data:res} = await uni.$http.get('/api/public/v1/categories')
      // console.log(res)
      if(res.meta.status !==200) return uni.$showMsg()
      this.catelist = res.message
      //为二级分类赋值
          this.catelevel2 = this.catelist[0].children
      },
      changeActive(i){
        this.active = i 
        //重新为二级分类赋值
         this.catelevel2 = this.catelist[i].children
         this.scrollTop = this.scrollTop === 0 ? 1:0 
      },
      gotgoodlist(item){
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?cid='+item.cat_id
        })
      },
      searchbox(){
      uni.navigateTo({
        url:'/s'
      })
      }
    }
	}
</script>

<style lang="scss">
.scroll-view-container{
  display: flex;
.left-scroll-box{
  width: 120px;
  .left-scroll-view-item{
    line-height: 60px;
    text-align:center;
    font-size: 12px;
    background-color: #F7F7F7;
    
    &.active {
      background-color: #FFFFFF;
      position: relative;
      
      &::before {
        content:' ';
        display: block;
        width: 3px;
        height: 30px;
        background-color: #c00000;
        position: absolute;
        top: 50%;
        left: 0;
        transform: translateY(-50%);
      }
    }
   
    
  }
}
}
.cate-lv2-title {
  font-size: 12px;
  font-weight: bold;
  text-align: center;
  padding: 15px 0;
}
.cate-lv3-list{
  display: flex;
  flex-wrap: wrap;
  .cate-lv3-item{
    width: 33.33%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    image {
      width: 60px;
      height: 60px;
    } 
    text{
      
    }
  }
  }
</style>
